A solid \( \mathrm{XY} \) has \( \mathrm{X} \) atoms forming \( \ma...

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A solid \( \mathrm{XY} \) has \( \mathrm{X} \) atoms forming \( \mathrm{PCC} \) and \( \mathrm{Y} \) atoms
P are at face-centers. Simplest formula of solid is

W
(A) \( \mathrm{X}_{2} \mathrm{Y}_{3} \)
(B) \( \mathrm{X}_{3} \mathrm{Y} \)
(C) \( \mathrm{XY}_{3} \)
(D) XY
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